Imaging lens

Abstract

An imaging lens comprises a first lens, a second lens, a third lens, a first reflection assembly and a second reflection assembly. The first lens has positive refractive power. The first reflection assembly comprises a first face, a second face and a third face, the first face is opposite to the third lens, the two sides of the first face are connected with one side of the second face and one side of the third face respectively, the other side of the second face is connected with the other side of the third face, and the second reflection assembly comprises a fourth face, a fifth face and a sixth face. The fourth surface is opposite to the third surface, one side of the fifth surface is connected with one side of the fourth surface, the other side of the fifth surface is connected with one side of the sixth surface, and the sixth surface faces the imaging surface.

Description

Technical Field

[0001] The invention relates to an imaging lens. Background Art

[0002] In order to achieve high-resolution imaging quality, existing imaging lenses often need to use more lens combinations to effectively eliminate aberrations, which results in the imaging lens being too long and too large in total, and unable to meet the needs of lightweight portable devices. Therefore, another imaging lens with a new architecture is needed to simultaneously meet the requirements of high resolution, miniaturization, and small size. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide an imaging lens, which has a shorter total length and a smaller lens volume, but still has good optical performance.

[0004] The present invention provides an imaging lens including a first lens, a second lens, a third lens, a first reflection component and a second reflection component. The first lens has positive refractive power. The second lens has refractive power. The third lens has refractive power. The first reflection component includes a first surface, a second surface and a third surface, and the first surface is opposite to the third lens. The second reflection component includes a fourth surface, a fifth surface and a sixth surface, and the fourth surface is opposite to the third surface. The first lens, the second lens, the third lens and the first reflection component are arranged in sequence from an object side along a first axis. The first reflection component and the second reflection component are arranged in sequence along the second axis. The second reflection component and the imaging surface are arranged in sequence along the third axis. The first axis intersects the second axis perpendicularly at one point, the second axis intersects the third axis non-perpendicularly at another point, and the extension of the first axis and the third axis does not intersect perpendicularly at another point. The first lens includes a concave surface facing the first surface. The imaging lens satisfies at least one of the following conditions: 34mm 2 <f×(T1+T2+T3)<44mm 2 ; 5mm 2 <f1×T2<24mm 2 ; 9 <TTL / (T1+T2+T3)<10;24.5<TTL / T2<35.5;9.5<f1 / T1<39.5;1.2<(f+TTL) / f1<4.1;55mm 2 <D1IMG×f1<158mm 2: 17 < f / T1 < 30; 44 < (R11 + R12) / T1 < 63; where f is the effective focal length of the imaging lens, f1 is the effective focal length of the first lens, T1 is the distance from the object side surface to the image side surface of the first lens along the first axis, T2 is the distance from the object side surface to the image side surface of the second lens along the first axis, T3 is the distance from the object side surface to the image side surface of the third lens along the first axis, TTL is the distance from the object side surface of the first lens to the imaging surface along the first axis, the second axis, and the third axis, D1IMG is the optical effective diameter of the image side surface of the first lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.

[0005] The first lens is a meniscus lens and may further include a convex surface facing the object side; the second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the first surface; and the third lens includes a concave surface facing the first surface.

[0006] The second lens has a positive refractive power; and the third lens is a meniscus lens with a negative refractive power and may further include a convex surface facing the object side.

[0007] The second lens has a negative refractive power; and the third lens is a meniscus lens with a positive refractive power and may further include a convex surface facing the object side.

[0008] The second lens has a positive refractive power; and the third lens is a biconcave lens with a negative refractive power and may further include another concave surface facing the object side.

[0009] The imaging lens satisfies at least one of the following conditions: 300mm 2 < f1×R12 < 800mm 2 ; 5mm 2 < f1×T2 < 24mm 2 ; 24.5 < TTL / T2 < 35.5; 37mm 2 < DisL1toP×f1 < 119mm 2 ; where f1 is the effective focal length of the first lens, the first axis T2 is the distance from the object side surface to the image side surface of the second lens along the first axis, TTL is the distance from the object side surface of the first lens to the imaging surface along the first axis, the second axis, and the third axis, DisL1toP is the distance from the object side surface of the first lens to the first surface of the first reflection component along the first axis, and R12 is the curvature radius of the image side surface of the first lens.

[0010] The two sides of the first surface are respectively connected to one side of the second surface and one side of the third surface, and the other side of the second surface is connected to the other side of the third surface; one side of the fifth surface is connected to one side of the fourth surface, and the other side of the fifth surface is connected to one side of the sixth surface, and the sixth surface faces the imaging surface; and a light ray from the object side is incident on the first reflection component from the first surface, and then emitted to the second surface, and the light ray is reflected at least twice inside the first reflection component, and finally emitted from the first reflection component from the third surface, and the light ray from the first reflection component is incident on the second reflection component from the fourth surface, and then emitted to the fifth surface, and the light ray is reflected at least once inside the second reflection component, and finally emitted from the second reflection component from the sixth surface.

[0011] The imaging lens of the present invention may further include an aperture disposed between the object side and the first lens, and the first reflection component is glued to the second reflection component.

[0012] The imaging lens of the present invention may further include a groove, and the groove is disposed on the first reflective component or the second reflective component.

[0013] The imaging lens satisfies at least one of the following conditions: -35≤Vd1-VdP1≤10; -55≤Vd2-VdP2≤0; 0mm≤f1+f2≤200mm; 0mm≤f2+f3≤180mm; -5≤f1 / f3≤4; wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, VdP1 is the Abbe coefficient of the first reflection component, and VdP2 is the Abbe coefficient of the second reflection component.

[0014] The imaging lens of the present invention has a short total lens length, a small lens volume, and a high resolution, but still has good optical performance. Specifically, the imaging lens of the present invention uses a reflective component so that the incident light is reflected multiple times inside the reflective component, so as to accommodate a telephoto lens and reduce the total length and volume of the imaging lens, thereby meeting the needs of a lightweight and thin portable device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0016] Figure 1 Schematic diagram of lens configuration and optical path of a first embodiment of an imaging lens according to the present invention.

[0017] Figure 2 FIG. 4 is a diagram of field curvature of the first embodiment of the imaging lens according to the present invention.

[0018] Figure 3 FIG. 5 is a distortion diagram of the first embodiment of the imaging lens according to the present invention.

[0019] Figure 4 FIG. 4 is a diagram of a modulation transfer function according to the first embodiment of the imaging lens of the present invention.

[0020] Figure 5 FIG. 4 is a schematic diagram of lens configuration and optical path of a second embodiment of an imaging lens according to the present invention.

[0021] Figure 6 4 is a field curvature diagram of the second embodiment of the imaging lens according to the present invention.

[0022] Figure 7 2 is a distortion diagram of the second embodiment of the imaging lens according to the present invention.

[0023] Figure 8 is a modulation transfer function diagram of the second embodiment of the imaging lens according to the present invention.

[0024] Fig. 9 FIG. 4 is a schematic diagram of lens configuration and optical path of a third embodiment of an imaging lens according to the present invention. DETAILED DESCRIPTION

[0025] The present invention provides an imaging lens, comprising: a first lens, the first lens having positive refractive power; a second lens, the second lens having refractive power; a third lens, the third lens having refractive power; a first reflection component, the first reflection component comprising a first surface, a second surface and a third surface, the first surface is opposite to the third lens, the two sides of the first surface are respectively connected to one side of the second surface and one side of the third surface, and the other side of the second surface is connected to the other side of the third surface; and a second reflection component, the second reflection component comprising a fourth surface, a fifth surface and a sixth surface, the fourth surface is opposite to the third surface, one side of the fifth surface is connected to one side of the fourth surface, the other side of the fifth surface is connected to one side of the sixth surface, and the sixth surface faces an imaging surface; wherein the first lens, the second lens and the third lens are connected to one side of the fourth surface, the second lens and the third lens are connected to one side of the sixth surface, and the sixth surface faces an imaging surface; and the first reflection component is arranged in sequence from an object side along a first axis; wherein the first reflection component and the second reflection component are arranged in sequence along a second axis; wherein the second reflection component and the imaging surface are arranged in sequence along a third axis; wherein the first lens includes a concave surface facing the first surface; wherein a light from the object side is incident on the first reflection component from the first surface, then emitted to the second surface, and the light is reflected at least twice inside the first reflection component, and finally emitted from the first reflection component from the third surface, and the light from the first reflection component is incident on the second reflection component from the fourth surface, then emitted to the fifth surface, and the light is reflected at least once inside the second reflection component, and finally emitted from the second reflection component from the sixth surface; wherein the imaging lens satisfies at least one of the following conditions: 34mm 2 <f×(T1+T2+T3)<44mm 2 ; 5mm 2 <f1×T2<24mm 2 ; 9 <TTL / (T1+T2+T3)<10;24.5<TTL / T2<35.5;9.5<f1 / T1<39.5;1.2<(f+TTL) / f1<4.1;55mm 2 <D1IMG×f1<158mm 2 ; 37mm 2 <DisL1toP×f1<119mm 2; Wherein, f is the effective focal length of the imaging lens, f1 is the effective focal length of the first lens, T1 is the distance from the object side surface of the first lens to the image side surface of the first lens on the first axis, T2 is the distance from the object side surface of the second lens to the image side surface of the second lens on the first axis, T3 is the distance from the object side surface of the third lens to the image side surface of the third lens on the first axis, TTL is the distance from the object side surface of the first lens to the imaging surface on the first axis, the second axis and the third axis, D1IMG is the optical effective diameter of the image side surface of the first lens, and DisL1toP is the distance from the object side surface of the first lens to the first surface of the first reflective component on the first axis. When the imaging lens of the present invention satisfies the above-mentioned features and at least one of the conditions therein, and no other additional features and conditions are required, the basic operation of the imaging lens of the present invention can be achieved.

[0026] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below, wherein Table 1, Table 4 and Table 7 are tables of relevant parameters of each lens of the first embodiment to the third embodiment of the imaging lens according to the present invention, and Table 2, Table 5 and Table 8 are tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4 and Table 7.

[0027] Figure 1 , 5 9 are respectively the lens configuration and optical path schematic diagrams of the first, second and third embodiments of the imaging lens of the present invention. Among them, the first lens L11, L21, L31 is a meniscus lens with positive refractive power, the object side surface S12, S22, S32 is convex, the image side surface S13, S23, S33 is concave, and the object side surface S12, S22, S32 and the image side surface S13, S23, S33 are all aspherical surfaces.

[0028] The second lens L12, L22, L32 is a meniscus lens with refractive power, and its object side surface S14, S24, S34 is convex, and the image side surface S15, S25, S35 is concave, and the object side surface S14, S24, S34 and the image side surface S15, S25, S35 are all aspherical surfaces. The third lens L13, L23, L33 has refractive power, and its image side surface S17, S27, S37 is concave, and the object side surface S16, S26, S36 and the image side surface S17, S27, S37 are all aspherical surfaces.

[0029] The first reflective components P11, P21, and P31 are prisms made of glass or plastic, with the first surfaces S18, S28, and S38 being planes, the second surfaces S19, S29, and S39 being planes, and the third surfaces S110, S210, and S310 being planes. The second reflective components P12, P22, and P32 are prisms made of glass or plastic, with the fourth surfaces S111, S211, and S311 being planes, the fifth surfaces S112, S212, and S312 being planes, and the sixth surfaces S113, S213, and S313 being planes. The configuration of the first reflective component and the second reflective component can shorten the total length of the imaging lens, thereby reducing the size of the imaging lens, and avoiding excessive occupation of the limited space of the device carrying the imaging lens.

[0030] In addition, the imaging lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (16):

[0031] 34 mm 2 < f × (T1+T2+T3) < 44 mm 2 ; (1)

[0032] 5 mm 2 < f1 × T2 < 24 mm 2 ; (2)

[0033] 9 < TTL / (T1+T2+T3) < 10; (3)

[0034] 24.5 < TTL / T2 < 35.5; (4)

[0035] 9.5 < f1 / T1 < 39.5; (5)

[0036] 1.2 < (f+TTL) / f1 < 4.1; (6)

[0037] 55 mm 2 < D1IMG × f1 < 158 mm 2 ; (7)

[0038] 37 mm 2 < DisL1toP × f1 < 119 mm 2 ; (8)

[0039] -35 ≤ Vd1-VdP1 ≤ 10; (9)

[0040] -55 ≤ Vd2-VdP2 ≤ 0; (10)

[0041] 0 mm ≤ f1+f2 ≤ 200 mm; (11)

[0042] 0 mm ≤ f2+f3 ≤ 180 mm; (12)

[0043] -5 ≤ f1 / f3 ≤ 4; (13)

[0044] 300 mm 2 < f1 × R12 < 800 mm 2 ; (14)

[0045] 17 < f / T1 < 30; (15)

[0046] 44 < (R11+R12) / T1 < 63; (16)

[0047] Wherein, f is the effective focal length of the imaging lenses 1, 2, and 3 in the first to third embodiments, f1 is the effective focal length of the first lens L11, L21, and L31 in the first to third embodiments, f2 is the effective focal length of the second lens L12, L22, and L32 in the first to third embodiments, f3 is the effective focal length of the third lens L13, L23, and L33 in the first to third embodiments, and T1 is the effective focal length of the first lens L11, L21, and L31 in the first to third embodiments. In the first to third embodiments, T2 is the distance between the object-side surface S14, S24, S34 of the second lens L12, L22, L32 and the image-side surface S15, S25, S35 of the second lens L12, L22, L32 on the first axis AX11, AX21, AX31, and T3 is the distance between the object-side surface S12, S22, S32 of the second lens L12, L22, L32 and the image-side surface S13, S23, S33 of the first lens L11, L21, L31 on the first axis AX11, AX21, AX31, and T4 is the distance between the object-side surface S14, S24, S34 of the second lens L12, L22, L32 and the image-side surface S15, S25, S35 of the second lens L12, L22, L32 on the first axis AX11, AX21, AX31, and T5 is the distance between the object-side surface S14, S24, S34 of the second lens L12, L22, L32 and the image-side surface S15, S25, S35 of the second lens L12, L22, L32 on the first axis AX11, AX21, AX31, and T6 is the distance between the object-side surface S14, S24, S34 of the second lens L12, L22, L32 and the image-side surface S15, S25, S35 of the second lens L12, L22, L32 on the first axis AX11, AX21, AX31, and T7 is the distance between the object-side surface S14, S24, S34 of the second lens L12 In the first to third embodiments, the distances between the object-side surfaces S16, S26, S36 of the third lens L13, L23, L33 and the image-side surfaces S17, S27, S37 of the third lens L13, L23, L33 on the first axes AX11, AX21, AX31 are as follows. TTL is the distance between the object-side surfaces S12, S22, S32 of the first lens L11, L21, L31 and the image planes IMA1, IMA2, IMA3 on the first axes AX11, AX21, AX31 in the first to third embodiments. 1. The spacing on AX31, the second axis AX12, AX22, AX32, and the third axis AX13, AX23, and AX33, i.e., the geometrical optical path from the object side S12, S22, and S32 of the first lens L11, L21, and L31 along the first axis AX11, AX21, AX31, the second axis AX12, AX22, AX32, and the third axis AX13, AX23, and AX33 to the imaging planes IMA1, IMA2, and IMA3. =In the first to third embodiments, D1IMG is the total length of the image-side surface S13, S23, S33 of the first lens L11, L21, L31. In the first to third embodiments, D1IMG is the optically effective diameter of the image-side surface S13, S23, S33 of the first lens L11, L21, L31. DisL1toP is the distance between the object-side surface S12, S22, S32 of the first lens L11, L21, L31 and the first surface S18, S28, S38 of the first reflective component P11, P21, P31 on the first axis AX11, AX21, AX31. R11 is the radius of curvature of the object-side surface S12, S22, S32 of the first lens L11, L21, L31. R12 is the radius of curvature of the image-side surface S13, S23, S33 of the first lens L11, L21, L31 in the first to third embodiments.In the first to third embodiments, Vd1 is the Abbe number of the first lenses L11, L21, L31, Vd2 is the Abbe number of the second lenses L12, L22, L32, VdP1 is the Abbe number of the first reflection components P11, P21, P31, and VdP2 is the Abbe number of the second reflection components P12, P22, P32. This enables the imaging lenses 1, 2, and 3 to effectively shorten the total length of the imaging lens, effectively reduce the volume of the imaging lens, effectively improve the resolution, and effectively correct the aberration. When the imaging lens satisfies at least one of the above conditions (1) to (16), it is a preferred embodiment of the imaging lens of the present invention.

[0048] When conditions (9): -35 ≤ Vd1 - VdP1 ≤ 10, condition (10): -55 ≤ Vd2 - VdP2 ≤ 0, condition (11): 0mm ≤ f1 + f2 ≤ 200mm, condition (12): 0mm ≤ f2 + f3 ≤ 180mm, and condition (13): -5 ≤ f1 / f3 ≤ 4 are satisfied, the lens materials can cooperate with each other to effectively correct chromatic aberration and improve the imaging quality. When condition (1): 34mm 2 <f × (T1 + T2 + T3) < 44mm 2 and condition (3): 9 < TTL / (T1 + T2 + T3) < 10 are satisfied, it helps to optimize the lens distribution of the imaging lens to achieve miniaturization. When condition (2): 5mm 2 <f1 × T2 < 24mm 2 condition (5): 9.5 < f1 / T1 < 39.5, and condition (15): 17 < f / T1 < 30 are satisfied, the coaxiality of the optical effective area can be improved. When condition (4): 24.5 < TTL / T2 < 35.5 is satisfied, it can effectively avoid the poor space utilization caused by overcrowded or loose lens arrangements, which is beneficial to the space utilization rate in the optical system. When condition (6): 1.2 < (f + TTL) / f1 < 4.1 is satisfied, it can effectively ensure a good balance between the miniaturization and manufacturability of the imaging lens. When condition (7): 55mm 2 <D1IMG × f1 < 158mm 2 is satisfied, the manufacturing yield in the mass production stage can be improved. When condition (8): 37mm 2 <DisL1toP × f1 < 119mm 2 is satisfied, the lens distribution between the object end and the first reflection component can be adjusted to ensure sufficient refractive power, further compressing the total length and size of the lens. When condition (14): 300mm 2 <f1 × R12 < 800mm 2, the lens surface shape and refractive power can be adjusted to improve the image quality at the center of the image. When condition (16) is met: 44<(R11+R12) / T1<63, the lens surface shape and thickness can be effectively configured to increase the field of view.

[0049] The first embodiment of the imaging lens of the present invention is now described in detail. Figure 1The imaging lens 1 includes an aperture ST1, a first lens L11, a second lens L12, a third lens L13, a first reflective component P11, a second reflective component P12, and a filter OF1. The aperture ST1, the first lens L11, the second lens L12, the third lens L13, and the first reflective component P11 are arranged in sequence from an object side along the first axis AX11. The first reflective component P11 and the second reflective component P12 are arranged in sequence along the second axis AX12. The imaging plane IMA1, the filter OF1, and the second reflective component P12 are arranged in sequence from the image side along the third axis AX13. The first axis AX11 and the second axis AX12 intersect perpendicularly at one point, the second axis AX12 and the third axis AX13 do not intersect perpendicularly at another point, and the extension line of the first axis AX11 and the extension line of the third axis AX13 do not intersect perpendicularly at another point. The first reflective component P11 includes a first surface S18, a second surface S19 and a third surface S110. The first surface S18 is opposite to the third lens L13. The two sides of the first surface S18 are connected to one side of the second surface S19 and one side of the third surface S110 respectively. The other side of the second surface S19 is connected to the other side of the third surface S110. The second reflective component includes a fourth surface S111, a fifth surface S112, a sixth surface S113 and a groove G1. The fourth surface S111 is opposite to the third surface S110. One side of the fifth surface S112 is connected to one side of the fourth surface S111. The other side of the fifth surface S112 is connected to one side of the sixth surface S113. The sixth surface S113 faces the imaging surface IMA1. The groove G1 is arranged on the other side opposite to the fifth surface S112. The concave area of ​​the groove G1 faces away from the fifth surface S112. The third surface S110 of the first reflective component P11 is glued to the fourth surface S111 of the second reflective component P12. However, the present invention is not limited thereto, and the groove G1 may be disposed at any position of the first reflective component P11 or the second reflective component P12 as required to achieve the effect of eliminating stray light and blocking ghost images. In addition, the third surface S110 of the first reflective component P11 and the fourth surface S111 of the second reflective component P12 may also be not glued together but have an air gap. During imaging, a light ray from the object side sequentially passes through the aperture ST1, the first lens L11, the second lens L12 and the third lens L13, and then enters the first reflection component P11 from the first surface S18, and then exits toward the second surface S19, and is reflected by the second surface S19 toward the first surface S18, and then is reflected by the first surface S18 toward the third surface S110. The light ray exits the first reflection component P11 from the third surface S110, and then enters the second reflection component P12 from the fourth surface S111, and then exits toward the fifth surface S112, and is reflected by the fifth surface S112 toward the sixth surface S113. The light ray finally exits the second reflection component P12 from the sixth surface S113, and is reflected twice inside the first reflection component P11, and once inside the second reflection component P12, and finally is imaged on the imaging surface IMA1.The groove G1 can effectively eliminate ghost images and stray light. According to the first to fifth paragraphs of [Specific Implementation], the second lens L12 has positive refractive power; the third lens L13 is a meniscus lens with negative refractive power, and its object side S16 is convex; the object side S114 and image side S115 of the filter OF1 are both planes; by using the above-mentioned lens, aperture ST1, first reflection component P11, second reflection component P12 and the design that satisfies at least one of conditions (1) to (16), the imaging lens 1 can effectively shorten the total length of the imaging lens, effectively reduce the size of the imaging lens, effectively improve the resolution, and effectively correct the aberration.

[0050] Table 1 Figure 1 Table of relevant parameters of each lens of imaging lens 1.

[0051] Table 1

[0052]

[0053]

[0054] The concavity z of the aspheric surface of the aspheric lens in Table 1 is obtained by the following formula: z = ch 2 / {1+[1-(k+1)c 2 h 2 ] 1 / 2}+Ah 4 +Bh 6 +Ch 8 +Dh 10 +Eh 12 +Fh 14 +Gh 16 Where: c: curvature; h: vertical distance from any point on the lens surface to the first axis; k: cone coefficient; A~G: aspheric coefficient.

[0055] Table 2 is a table of related parameters of the aspherical surface of the aspherical lens in Table 1, wherein k is the conic constant, and A-G are aspherical coefficients.

[0056] Table 2

[0057]

[0058] Table 3 shows the relevant parameter values ​​of the imaging lens 1 of the first embodiment and the calculated values ​​corresponding to conditions (1) to (16). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the requirements of conditions (1) to (16).

[0059] Table 3

[0060]

[0061] The imaging lens 1 can also be modified to satisfy only any one of conditions (1) to (16) and the first lens has positive refractive power, the second lens has refractive power, the third lens has refractive power, the image side surface of the first lens is a concave surface, the first reflective component includes a first surface, a second surface and a third surface, and the second reflective component includes a fourth surface, a fifth surface and a sixth surface. No other additional conditions and features are required to achieve the basic operation of the imaging lens of the present invention.

[0062] In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. Figure 2 It can be seen that the field curvature of the imaging lens 1 of the first embodiment is between -0.05mm and 0.04mm. Figure 3 It can be seen that the distortion of the imaging lens 1 of the first embodiment is between 0% and 0.8%. Figure 4 It can be seen that the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.47 and 1.0. It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance. The imaging lens 1 of the first embodiment above meets any one of conditions (1) to (16) and the refractive power and surface shape of Tables 1 and 2, and is a preferred embodiment of the present invention.

[0063] The second embodiment of the imaging lens of the present invention is now described in detail. Figure 5, the imaging lens 2 includes an aperture ST2, a first lens L21, a second lens L22, a third lens L23, a first reflection component P21, a second reflection component P22 and a filter OF2. The aperture ST2, the first lens L21, the second lens L22, the third lens L23 and the first reflection component P21 are arranged in sequence from an object side along the first axis AX21. The first reflection component P21 and the second reflection component P22 are arranged in sequence along the second axis AX22. The imaging plane IMA2, the filter OF2 and the second reflection component P22 are arranged in sequence from the image side along the third axis AX23. The first axis AX21 and the second axis AX22 intersect perpendicularly at one point, the second axis AX22 and the third axis AX23 do not intersect perpendicularly at another point, and the extension line of the first axis AX21 and the extension line of the third axis AX23 do not intersect perpendicularly at another point. The first reflective component P21 includes a first surface S28, a second surface S29 and a third surface S210. The first surface S28 is opposite to the third lens L23. The two sides of the first surface S28 are respectively connected to one side of the second surface S29 and one side of the third surface S210, and the other side of the second surface S29 is connected to the other side of the third surface S210. The second reflective component includes a fourth surface S211, a fifth surface S212, a sixth surface S213 and a groove G2. The fourth surface S211 is opposite to the third surface S210. One side of the fifth surface S212 is connected to one side of the fourth surface S211, and the other side of the fifth surface S212 is connected to one side of the sixth surface S213. The sixth surface S213 faces the imaging surface IMA2. The groove G2 is arranged on the other side opposite to the fifth surface S212, and the concave area of ​​the groove G2 faces away from the fifth surface S212. The third surface S210 of the first reflective component P21 is glued to the fourth surface S211 of the second reflective component P22. However, the present invention is not limited to this. The groove G2 can be set at any position of the first reflective component P21 or the second reflective component P22 as required to achieve the effect of eliminating stray light and blocking ghost images. In addition, the third surface S210 of the first reflective component P21 and the fourth surface S211 of the second reflective component P22 can also be not glued together but have an air gap. During imaging, a light ray from the object side sequentially passes through the aperture ST2, the first lens L21, the second lens L22 and the third lens L23, and then enters the first reflection component P21 from the first surface S28, and then exits toward the second surface S29, and is reflected by the second surface S29 toward the first surface S28, and then is reflected by the first surface S28 toward the third surface S210. The light ray exits the first reflection component P21 from the third surface S210, and then enters the second reflection component P22 from the fourth surface S211, and then exits toward the fifth surface S212, and is reflected by the fifth surface S212 toward the sixth surface S213. The light ray finally exits the second reflection component P22 from the sixth surface S213, and is reflected twice inside the first reflection component P21, and once inside the second reflection component P22, and finally forms an image on the imaging surface IMA2.The groove G2 can effectively eliminate ghost images and stray light. According to the first to fifth paragraphs of [Specific Implementation], the second lens L22 has negative refractive power; the third lens L23 is a meniscus lens with positive refractive power, and its object side S26 is convex; the object side S214 and image side S215 of the filter OF2 are both planes; by using the above-mentioned lens, aperture ST2, first reflection component P21, second reflection component P22 and a design that satisfies at least one of conditions (1) to (13), the imaging lens 2 can effectively shorten the total length of the imaging lens, effectively reduce the size of the imaging lens, effectively improve the resolution, and effectively correct aberrations.

[0064] Table 4 is Figure 5 Table of relevant parameters of each lens of imaging lens 2.

[0065] Table 4

[0066]

[0067]

[0068] The definition of the aspheric surface concavity z of each lens in Table 4 is the same as the definition of the aspheric surface concavity z of each lens in Table 1 of the first embodiment, and will not be repeated here.

[0069] Table 5 is a table of related parameters of the aspherical surface of the aspherical lens in Table 4, wherein k is the conic constant and A-G are aspherical coefficients.

[0070] Table 5

[0071]

[0072] Table 6 shows the relevant parameter values ​​of the imaging lens 2 of the second embodiment and the calculated values ​​corresponding to conditions (1) to (13). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the requirements of conditions (1) to (13).

[0073] Table 6

[0074]

[0075]

[0076] The imaging lens 2 can also be modified to satisfy only any one of conditions (1) to (13) and the first lens has positive refractive power, the second lens has refractive power, the third lens has refractive power, the image side surface of the first lens is a concave surface, the first reflective component includes a first surface, a second surface and a third surface, and the second reflective component includes a fourth surface, a fifth surface and a sixth surface. Without other additional conditions and features, the basic operation of the imaging lens of the present invention can be achieved.

[0077] In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. Figure 6 It can be seen that the field curvature of the imaging lens 2 of the second embodiment is between -0.07mm and 0.04mm. Figure 7 It can be seen that the distortion of the imaging lens 2 of the second embodiment is between 0% and 0.4%. Figure 8 It can be seen that the modulation transfer function value of the imaging lens 2 of the second embodiment is between 0.37 and 1.0. It is obvious that the field curvature and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance. The imaging lens 2 of the second embodiment above meets any one of conditions (1) to (13) and the refractive power and surface shape of Tables 4 and 5, and is a preferred embodiment of the present invention.

[0078] The third embodiment of the imaging lens of the present invention will now be described in detail. Fig. 9The imaging lens 3 includes an aperture ST3, a first lens L31, a second lens L32, a third lens L33, a first reflection component P31, a second reflection component P32 and a filter OF3. The aperture ST3, the first lens L31, the second lens L32, the third lens L33 and the first reflection component P31 are arranged in sequence from an object side along the first axis AX31. The first reflection component P31 and the second reflection component P32 are arranged in sequence along the second axis AX32. The imaging plane IMA3, the filter OF3 and the second reflection component P32 are arranged in sequence from the image side along the third axis AX33. The first axis AX31 and the second axis AX32 intersect perpendicularly at one point, the second axis AX32 and the third axis AX33 do not intersect perpendicularly at another point, and the extension line of the first axis AX31 and the extension line of the third axis AX33 do not intersect perpendicularly at another point. The first reflective component P31 includes a first surface S38, a second surface S39 and a third surface S310. The first surface S38 is opposite to the third lens L33. The two sides of the first surface S38 are respectively connected to one side of the second surface S39 and one side of the third surface S310, and the other side of the second surface S39 is connected to the other side of the third surface S310. The second reflective component includes a fourth surface S311, a fifth surface S312, a sixth surface S313 and a groove G3. The fourth surface S311 is opposite to the third surface S310. One side of the fifth surface S312 is connected to one side of the fourth surface S311, and the other side of the fifth surface S312 is connected to one side of the sixth surface S313. The sixth surface S313 faces the imaging surface IMA3. The groove G3 is arranged on the other side opposite to the fifth surface S312, and the concave area of ​​the groove G3 faces away from the fifth surface S312. The third surface S310 of the first reflective component P31 is glued to the fourth surface S311 of the second reflective component P32. However, the present invention is not limited to this. The groove G3 can be set at any position of the first reflective component P31 or the second reflective component P32 as required to achieve the effect of eliminating stray light and blocking ghost images. In addition, the third surface S310 of the first reflective component P31 and the fourth surface S311 of the second reflective component P32 can also be not glued but have an air gap. During imaging, a light ray from the object side sequentially passes through the aperture ST3, the first lens L31, the second lens L32 and the third lens L33, and then enters the first reflection component P31 from the first surface S38, and then is emitted to the second surface S39, and is reflected by the second surface S39 to the first surface S38, and then is reflected by the first surface S38 to the third surface S310. The light ray is emitted from the first reflection component P31 from the third surface S310, and then enters the second reflection component P32 from the fourth surface S311, and then is emitted to the fifth surface S312, and is reflected by the fifth surface S312 to the sixth surface S313. The light ray is finally emitted from the second reflection component P32 from the sixth surface S313, and is reflected twice inside the first reflection component P31, and once inside the second reflection component P32, and finally is imaged on the imaging surface IMA3.The groove G3 can effectively eliminate ghost images and stray light. According to the first to fifth paragraphs of [Specific Implementation], the second lens L32 has positive refractive power; the third lens L33 is a double concave lens with negative refractive power, and its object side S36 is a concave surface; the object side S314 and the image side S315 of the filter OF3 are both planes; by using the above-mentioned lens, aperture ST3, first reflection component P31, second reflection component P32 and a design that satisfies at least one of conditions (1) to (16), the imaging lens 3 can effectively shorten the total length of the imaging lens, effectively reduce the size of the imaging lens, effectively improve the resolution, and effectively correct the aberration.

[0079] Table 7 Fig. 9 Table of relevant parameters of each lens of imaging lens 3.

[0080] Table 7

[0081]

[0082]

[0083] The definition of the aspheric surface concavity z of each lens in Table 7 is the same as the definition of the aspheric surface concavity z of each lens in Table 1 of the first embodiment, and will not be repeated here.

[0084] Table 8 is a table of related parameters of the aspherical surface of the aspherical lens in Table 7, wherein k is the conic constant, and A~G are aspherical coefficients.

[0085] Table 8

[0086]

[0087] Table 9 shows the relevant parameter values ​​of the imaging lens 3 of the third embodiment and the calculated values ​​corresponding to conditions (1) to (16). It can be seen from Table 9 that the imaging lens 3 of the third embodiment can meet the requirements of conditions (1) to (16).

[0088] Table 9

[0089]

[0090]

[0091] The imaging lens 3 can also be modified to satisfy only any one of conditions (1) to (16) and the first lens has positive refractive power, the second lens has refractive power, the third lens has refractive power, the image side surface of the first lens is a concave surface, the first reflective component includes a first surface, a second surface and a third surface, and the second reflective component includes a fourth surface, a fifth surface and a sixth surface. No other additional conditions and features are required to achieve the basic operation of the imaging lens of the present invention.

[0092] In addition, the field curvature (illustration omitted) and distortion (illustration omitted) of the imaging lens 3 of the third embodiment can also be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance. The imaging lens 3 of the third embodiment above meets any one of conditions (1) to (16) and the refractive power and surface shape of Tables 7 and 8, and is a preferred embodiment of the present invention.

[0093] It is understandable that the aforementioned imaging lenses 1, 2, 3 include three lenses with refractive power, but the present invention is not limited to this. The imaging lenses 1, 2, 3 may further include a fourth lens, a fifth lens, etc., or the imaging lenses 1, 2, 3 may be modified to include only two or one lens. In other words, the imaging lens may include at least one or more lenses.

[0094] Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An imaging lens, characterized in that: include: A first lens having positive refractive power; a second lens having a refractive power; a third lens having refractive power; A first reflective component, the first reflective component comprising a first surface, a second surface and a third surface, the first surface and the third lens are opposite to each other; as well as A second reflective component, the second reflective component comprising a fourth surface, a fifth surface and a sixth surface, the fourth surface being opposite to the third surface; wherein the first lens, the second lens, the third lens and the first reflective component are arranged in sequence from an object side along a first axis; The first reflective component and the second reflective component are arranged in sequence along the second axis; wherein the second reflective component and the imaging surface are arranged in sequence along a third axis; The first axis intersects the second axis perpendicularly at one point, the second axis intersects the third axis non-perpendicularly at another point, and the extension line of the first axis intersects the extension line of the third axis non-perpendicularly at yet another point; The first lens includes a concave surface facing the first surface; The imaging lens satisfies at least one of the following conditions: 34mm 2 <f×(T1+T2+T3)<44mm 2 ; 9 <TTL / (T1+T2+T3)<10; 9.5 <f1 / T1<39.5; 1.2<(f+TTL) / f1<4.1; 55mm 2 <D1IMG×f1<158mm 2 ; 17 <f / T1<30; 44<(R11+R12) / T1<63; Wherein, f is the effective focal length of the imaging lens, f1 is the effective focal length of the first lens, T1 is the distance from the object side surface of the first lens to the image side surface of the first lens on the first axis, T2 is the distance from the object side surface of the second lens to the image side surface of the second lens on the first axis, T3 is the distance from the object side surface of the third lens to the image side surface of the third lens on the first axis, TTL is the distance from the object side surface of the first lens to the imaging plane on the first axis, the second axis and the third axis, D1IMG is the optical effective diameter of the image side surface of the first lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.

2. The imaging lens according to claim 1, wherein: The first lens is a meniscus lens and further includes a convex surface facing the object side; The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the first surface; as well as The third lens includes a concave surface facing the first surface.

3. The imaging lens according to claim 2, wherein: The second lens has positive refractive power; and The third lens is a meniscus lens with negative refractive power and further includes a convex surface facing the object side.

4. The imaging lens according to claim 2, wherein: The second lens has negative refractive power; and The third lens is a meniscus lens with positive refractive power and further includes a convex surface facing the object side.

5. The imaging lens according to claim 2, wherein: The second lens has positive refractive power; and The third lens is a biconcave lens with negative refractive power and further includes another concave surface facing the object side.

6. The imaging lens according to claim 2, wherein: The imaging lens meets at least one of the following conditions: 300mm 2 <f1×R12<800mm 2 ; 5mm 2 <f1×T2<24mm 2 ; 24.5 <TTL / T2<35.5; <h2 style=";text-align:left;direction:ltr">37mm<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"><DisL1toP×f1<119mm <h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> ; Among them, f1 is the effective focal length of the first lens, the first axis T2 is the distance from the object side of the second lens to the image side of the second lens on the first axis, TTL is the distance from the object side of the first lens to the imaging plane on the first axis, the second axis and the third axis, DisL1toP is the distance from the object side of the first lens to the first surface of the first reflective component on the first axis, and R12 is the radius of curvature of the image side of the first lens.

7. The imaging lens according to claim 1, wherein: Two sides of the first surface are connected to one side of the second surface and one side of the third surface respectively, and the other side of the second surface is connected to the other side of the third surface; One side of the fifth surface is connected to one side of the fourth surface, the other side of the fifth surface is connected to one side of the sixth surface, and the sixth surface faces the imaging surface; and A light ray from the object side enters the first reflective component from the first surface and then emits toward the second surface. The light ray is reflected at least twice inside the first reflective component and finally emits out of the first reflective component from the third surface. The light ray from the first reflective component enters the second reflective component from the fourth surface and then emits toward the fifth surface. The light ray is reflected at least once inside the second reflective component and finally emits out of the second reflective component from the sixth surface.

8. The imaging lens according to claim 1, wherein: The invention further comprises an aperture arranged between the object side and the first lens, and the first reflection component is glued to the second reflection component.

9. The imaging lens according to claim 1, wherein: It further includes a groove, which is disposed on the first reflective component or the second reflective component.

10. The imaging lens according to any one of claims 1 to 9, characterized in that: The imaging lens meets at least one of the following conditions: -35≤Vd1-VdP1≤10; -55≤Vd2-VdP2≤0; 0mm≤f1+f2≤200mm; 0mm≤f2+f3≤180mm; -5≤f1 / f3≤4; Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, Vd1 is the Abbe coefficient of the first lens, Vd2 is the Abbe coefficient of the second lens, VdP1 is the Abbe coefficient of the first reflection component, and VdP2 is the Abbe coefficient of the second reflection component.

Images